XGS-600 Gauge Controller
DRAFT 4/15/14
47
Tips
Agilent offers reference ionization B/A gauges, which are sealed off at approximately 5E–6
Torr/6.6E–4 Pa, as well as a Convection gauge simulator which can switch between
atmosphere and vacuum simulation. These devices are extremely helpful in troubleshooting
a vacuum system problem by isolating the defective component.
NOTE These reference gauges and stimulators are not NIST traceable
calibrated gauges, and should not be used for calibration.
Troubleshooting Table
Fault
(Analog boards only)
Active gauge
voltage < 0.5 V
❑ Gauge defective
❑ Cable defective
❑ Gauge drifted
1. Check cable
2. Check active gauge
Replace if necessary
Under
(Analog boards only)
CDG voltage
negative or below
previous VAC CAL
❑ CDG has drifted
1. Press CAL
2. Readjust zero at CDG
Table 4-1 General Error Codes (Continued) (Continued)
Error Message Meaning Cause Action
Table 4-2 Troubleshooting
Problem Cause Action
Hot filament gauge hunts or
cycles around 1E-5Torr (1E-3Pa)
Auto emission adjustment
occurs at this pressure.
Increased filament power causes
a rise in pressure. Condition will
clear as system pressure
decreases.
If taking pressure measurements
in this range, reduce emission
current setting for the gauge to
1.0 mA or less to turn off feature
IMG displays readings in the –11
Torr range when the pressure is
known to be higher
Sometimes after a long time
period the reading becomes
correct
❑ IMG cable not plugged in
❑ IMG has not started
❑ IMG took a long time to start
1. Check that cable is attached
2. Sometimes IMG’s are hard to
start when turned on at high
vacuum
3. Raise pressure
4. Clean or replace IMG
HFIG bd reads UHV when
pressure is know to be higher
❑ Emission current not estab-
lished due to worn out Th-Ir
filament
❑ Collector cable unplugged
❑ HFIG board failure
1. Check collector connection at
gauge (glass BA) and at XGS-600
2. Replace gauge or filament
3. Return unit for repair/replace
HFIG bd
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